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Anyone want to know about greys and roans...?

Discussion in 'Breeds, Colouring and Genetics' started by chev, Feb 4, 2005.

  1. balnecroft

    balnecroft New Member

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    HI I am new to the site and been sat here all morning reading this thread adn not got anything done at all outside with the horses as yet, I would just like to say it is a great thread and would like to show you a couple of photo of my girls
    they are both full sister out of the same mare by the same stallion i just hope that i can post them ok


    This is my yearling Filly "JAZZ"

    [​IMG]

    [​IMG]

    This is her Full sister Mazie she is 5

    [​IMG]
     
  2. chev

    chev Moderator

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    She's pretty. Both roans too; Jazz is chestnut (or strawberry) roan and her sister is bay (or red) roan.
     
  3. kelp

    kelp New Member

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    I love this discussion and information, but ...I need more. How many color genes does a horse carry? For instance, is the color governed by 7 pairs of genes, or 12, or 2? I would think it would be the same number for every horse. ?
     
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  5. kelp

    kelp New Member

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    I would buy that book! LOL
     
    chev likes this.
  6. chev

    chev Moderator

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    A gene is a region of DNA that carries information about what any given cell does. DNA is held in kind of storage type things called chromosomes. For the most part each horse will get a matching pair of chromosomes, one from each parent. The location of a gene on a chromosome is called it's locus. Alternate forms of a gene are called alleles.

    Research into colour genes is still going on. But there are a few known and which can be tested for.

    E - ability to provide black pigment

    A - distribution of black pigment

    C - pigment dilution

    D - dun pattern and dilution

    TO - tobiano spotting pattern

    W - inability to form pigment in skin and hair

    G - exclusion of pigment from hair

    There are more genes being found all the time. Like silver dapple, which is situated on the Z locus.

    At the moment there are eight known genes as listed above. But they're don't stop there - that's without bringing Appaloosa colouring into the mix. Then there's patterns like sabino, splash, and frame. The biggest problem is identifying all the genes in the first place. There are literally millions of genes in the human (it's about five million). I'm not sure how many millions a horse has but it's in the same region.
     
  7. Jane&Ziggy

    Jane&Ziggy Learning together!

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    Fabulous thread. I just glanced back at the start and learned about "corn marks" - @chev, do these apply to greys too? Ziggy has a dark grey mark where he was bitten which is not fading to white with the rest of him.
     
  8. chev

    chev Moderator

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    It could be what's called a bloody shoulder mark. These are patches of colour on greys that don't grey out and can occur anywhere on the body in spite of the name. The cause of these markings is unknown but they seem to crop up in in Arabs or TBs mostly from the references I've seen.
     
  9. Jane&Ziggy

    Jane&Ziggy Learning together!

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    @chev Well, it's just that I know it is a bite mark because I was there when he was bitten!
     
  10. horzelover

    horzelover New Member

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